The effect of reduction degree of GO nanosheets on microstructure and performance of PVDF/GO hybrid membranes

Meng, Na; Priestley, Rebecca Claire Eve; Zhang, Yanqiu; Wang, Huanting; Zhang, Xiwang

doi:10.1016/j.memsci.2015.12.004

Cited by 129 publications

(35 citation statements)

References 38 publications

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“…Having as target the development of efficient membranes for desalination with DCMD, reduced GO (rGO) can be used as alternative to meet the challenge of enhanced water vapor flux, salt rejection, and hydrophobicity. Indeed, recent studies have shown that the incorporation of rGO can provoke slight increase rather than decrease of the contact angle . The modification in the direction of hydrophobicity enhancement was rather clear when the rGO concentration (based on the weight of PVDF) was kept below the level of 0.1 wt%.…”

Section: Introductionmentioning

confidence: 95%

“…Moreover we followed a novel procedure to prepare near‐surface modified GO/PVDF membranes by using aqueous GO dispersions as the coagulant solvent instead of applying the conventional process of dispersing GO in the polymer solution. As in recent studies, both GO (at very low concentrations per polymer mass) and graphene stacks are used as pore and hydrophobicity enhancers of PVDF membranes , our target was to compare these two types of membranes as regards their DCMD performance and scaling behavior at different G and GO loadings. The performance of the G/PVDF mixed matrix and GO/PVDF composite‐skin membranes was evaluated in terms of water permeate flux, salt rejection, and performance stability.…”

Section: Introductionmentioning

confidence: 99%

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Mixed Matrix PVDF/Graphene and Composite‐Skin PVDF/Graphene Oxide Membranes Applied in Membrane Distillation

Athanasekou

Sapalidis

Katris

et al. 2018

Polymer Engineering & Sci

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This work elucidates the influence of graphene (G) and graphene oxide (GO) content on the desalination performance and scaling characteristics of G/polyvinylidene fluoride (G/PVDF) mixed matrix and GO/PVDF composite‐skin membranes, applied in a direct contact membrane distillation process (DCMD). Inclusion of high quality, nonoxidized, monolayered graphene sheets as polymer membrane filler, and application of a novel GO/water‐bath coagulation method for the preparation of the GO/PVDF composite films, took place. Water permeability and desalination tests via DCMD, revealed that the optimal G content was 0.87 wt%. At such concentration the water vapor flux of the G/PVDF membrane was 1.7 times that of the nonmodified reference, while the salt rejection efficiency was significantly improved (99.8%) as compared to the neat PVDF. Similarly the GO/PVDF surface‐modified membrane, prepared using a GO dispersion with low concentration (0.5 g/L), exhibited twofold higher water vapor permeate flux as compared to the neat PVDF, but however, its salt rejection efficiency was moderate (80%), probably due to pore wetting during DCMD. The relatively low scaling tendency observed for both G and GO modified membranes is primarily attributed to their smoother surface texture as compared to neat PVDF, while scaling is caused by the deposition of calcite crystals, identified by XRPD analysis. POLYM. ENG. SCI., 59:E262–E278, 2019. © 2018 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Mixed Matrix PVDF/Graphene and Composite‐Skin PVDF/Graphene Oxide Membranes Applied in Membrane Distillation

Athanasekou

Sapalidis

Katris

et al. 2018

Polymer Engineering & Sci

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“…As a result, the phase inversion process is inhibited, leading to dense "sponge" pores. 40 Fig . 5 shows the three-dimensional AFM images of M0, M1 and M1-g-PEG.…”

Section: Resultsmentioning

confidence: 99%

PEGylated polyvinylidene fluoride membranesviagrafting from a graphene oxide additive for improving permeability and antifouling properties

Chen

Zhang

et al. 2019

RSC Adv.

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“…Previous studies reported that the incorporation of graphene nanosheets had impacts on the PVDF crystallization. Due to the special affinity between PVDF and carbon surface, the graphene nanosheets worked as nucleating agents for PVDF precipitation and led to the PVDF crystalline transition [17,18]. After the nanographite addition, the lamellar splay morphology appeared in the surface.…”

Section: Xrd and Dsc Of The Composite Membranementioning

confidence: 99%

Preparation of hydrophobic PVDF/PVC/nano-graphite composite membrane and its self-cleaning properties

Zhang

et al. 2020

Mater. Res. Express

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In this study, novel physical blending modified membranes are prepared using the non-solvent induced phase separation method, the influences of nano-graphite and Poly(vinyl chloride) (PVC) incorporated into the hydrophobic performance of the polyvinylidene fluoride (PVDF) membrane were investigated. The composite membrane was prepared not only reduces the cost of producing PVDF membrane, but also enhances the hydrophobicity of the membrane. The addition of nano graphite and PVC accelerated the phase transformation of PVDF and changed the crystal structure of PVDF. Therefore, the surface roughness of the composite membrane is changed, and the hydrophobicity of the composite membrane is enhanced compared with the original PVDF membrane. the crystal structure and crystallinity of the composite membranes can be analyzed by WAXD and DSC, the surfaces morphology of the composite membranes were characterized by SEM and AFM, the wetting and hydrophobicity of the composite membrane by CA and SFE. The experimental results show that adding a small amount of nano inorganic substance (nano graphite) to the (PVDF-PVC) blend polymer is an effective method to prepare and improve the hydrophobic performance of the blend polymer membrane. The PVDF-PVC/nano-graphite prepared in the experiment not only improves the hydrophobic performance of the PVDF membrane, but also reduces the cost of the composite membrane through the addition of PVC. Meanwhile, the membrane has a durable self-cleaning performance, which widens the applications of PVDF membranes.

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The effect of reduction degree of GO nanosheets on microstructure and performance of PVDF/GO hybrid membranes

Cited by 129 publications

References 38 publications

Mixed Matrix PVDF/Graphene and Composite‐Skin PVDF/Graphene Oxide Membranes Applied in Membrane Distillation

Mixed Matrix PVDF/Graphene and Composite‐Skin PVDF/Graphene Oxide Membranes Applied in Membrane Distillation

PEGylated polyvinylidene fluoride membranesviagrafting from a graphene oxide additive for improving permeability and antifouling properties

Preparation of hydrophobic PVDF/PVC/nano-graphite composite membrane and its self-cleaning properties

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